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| Titel |
Formulation, calibration and validation of the DAIS model (version 1), a simple Antarctic ice sheet model sensitive to variations of sea level and ocean subsurface temperature |
| VerfasserIn |
G. Shaffer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 7, no. 4 ; Nr. 7, no. 4 (2014-08-27), S.1803-1818 |
| Datensatznummer |
250115684
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| Publikation (Nr.) |
 copernicus.org/gmd-7-1803-2014.pdf |
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| Zusammenfassung |
| The DCESS (Danish Center for Earth System Science) Antarctic Ice Sheet (DAIS) model is presented. Model hindcasts of
Antarctic ice sheet (AIS) sea level equivalent are forced by reconstructed
Antarctic temperatures, global mean sea level and high-latitude, ocean
subsurface temperatures, the latter calculated using the DCESS model forced by reconstructed global mean
atmospheric temperatures. The model is calibrated by comparing such
hindcasts for different model configurations with paleoreconstructions of
AIS sea level equivalent from the last interglacial, the last glacial
maximum and the mid-Holocene. The calibrated model is then validated against
present estimates of the rate of AIS ice loss. It is found that a high-order
dependency of ice flow at the grounding line on water depth there is needed
to capture the observed response of the AIS at ice age terminations.
Furthermore, it is found that a dependency of this ice flow on ocean
subsurface temperature by way of ice shelf demise and a resulting
buttressing decrease is needed to explain the contribution of the AIS to
global mean sea level rise at the last interglacial. When forced and
calibrated in this way, model hindcasts of the rate of present-day AIS ice
loss agree with recent, data-based estimates of this ice loss rate. |
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